24 Farmers’ Bulletin 1270. 
aphids and, if the nicotine sulphate is added to the lime-sulphur spray, there will 
be no necessity for making separate applications against scale insects and apple 
aphids. This combination treatment, popularly known as the “ delayed dor- 
mant,” consists of three-eighths of a pint of 40 per cent nicotine sulphate and 
about 62 gallons of concentrated lime-sulphur (32° Baumé), with sufficient water 
to make a total of 50 gallons. Soap should not be added to any solution con- 
taining lime-sulphur solution. This spray should be applied when the bud tips 
show green and completed by the time the leaf tips have begun to separate. 
Orchardists with considerable acreage to treat, and planning to make the 
Fig. 43.—Apples injured and stunted by rosy apple aphis. Commonly called “ aphis 
apples.” 
“delayed dormant” application, should be sure to have adequate equip- 
ment to accomplish the work before the foliage expands to any appreciable 
extent. 
GREEN APPLE APHIS.* 
The green apple aphis hatches from overwintering eggs in the spring about 
the same time as the rosy aphis, but unlike the latter feeds during the entire 
season upon the apple. It is often injurious to bearing orchards, but is much 
more serious aS a nursery pest and in young orchards, sucking sap from the 
tender shoots and leaves (fig. 44), the latter becoming much curled, the attack 
materially checking the growth, especially during periods of drought. This 
insect secretes a large amount of honeydew on which ants feed; these often 
are quite abundant and are mistaken for the real depredator. A black fungus 
grows on the honeydew, giving the foliage and shoots a sootlike appearance. 
The green apple aphis is widely disseminated throughout the United States, 
feeding principally on the apple, but it has also been recorded upon the pear, 
wild crab, and. white thorn. 
18 Aphis pomi DeGeer, 
